SINGLE EXPONENTIAL, P-40 = 1 (cont’d)
FLUMES (cont’d)
Leopold Lagco
(as manufactured by Leopold Co., Inc.)
•
designed to be installed directly
into pipelines and manholes
•
Leopold Lagco may be classed
as a rectangular Palmer-Bowlus
flume
•
sized by pipe (sewer) diameter
•
for rated flows under free flow
conditions, the head is
measured at a point upstream
referenced to the beginning of
the converging section. Refer to
the following table.
Flume Size Point of Measurement
(pipe dia. in inches) cm Inches
4 — 12 2.5 1
15 3.2 1-1/4
18 4.4 1-3/4
21 5.1 2
24 6.4 2-1/2
30 7.6 3
42 8.9 3-1/2
48 10.2 4
54 11.4 4-1/2
60 12.7 5
66 14.0 5-1/2
72 15.2 6
•
general free flow equation is Q = KH
x
where Q = flow rate
K = constant
H = head
x = exponent
•
position the transducer such that it is centered over the flow at
a minimum height of 30 cm (12") above the maximum head.
converging
throat
diverging
Q
plan
point of measurement
side
front
0 head
transducer
PL-399 6 – 37
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